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[NTOS:PNP] Fix resource conflict detection

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Previous code did not detect equal resource ranges as conflicting.
Thanks Hervé Poussineau for pointing this out!

Meanwhile, simplify the code to make it more readable.
This commit is contained in:
Victor Perevertkin
2021-10-13 00:00:25 +03:00
committed by GitHub
parent 025f58a051
commit 43f1d91687
1 changed files with 38 additions and 28 deletions
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66
ntoskrnl/io/pnpmgr/pnpres.c
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@@ -590,18 +590,21 @@ IopCheckResourceDescriptor(
switch (ResDesc->Type)
{
case CmResourceTypeMemory:
if (((ULONGLONG)ResDesc->u.Memory.Start.QuadPart < (ULONGLONG)ResDesc2->u.Memory.Start.QuadPart &&
(ULONGLONG)ResDesc->u.Memory.Start.QuadPart + ResDesc->u.Memory.Length >
(ULONGLONG)ResDesc2->u.Memory.Start.QuadPart) || ((ULONGLONG)ResDesc2->u.Memory.Start.QuadPart <
(ULONGLONG)ResDesc->u.Memory.Start.QuadPart && (ULONGLONG)ResDesc2->u.Memory.Start.QuadPart +
ResDesc2->u.Memory.Length > (ULONGLONG)ResDesc->u.Memory.Start.QuadPart))
{
/* NOTE: ranges are in a form [x1;x2) */
UINT64 rStart = (UINT64)ResDesc->u.Memory.Start.QuadPart;
UINT64 rEnd = (UINT64)ResDesc->u.Memory.Start.QuadPart
+ ResDesc->u.Memory.Length;
UINT64 r2Start = (UINT64)ResDesc2->u.Memory.Start.QuadPart;
UINT64 r2End = (UINT64)ResDesc2->u.Memory.Start.QuadPart
+ ResDesc2->u.Memory.Length;
if (rStart < r2End && r2Start < rEnd)
{
if (!Silent)
{
DPRINT1("Resource conflict: Memory (0x%I64x to 0x%I64x vs. 0x%I64x to 0x%I64x)\n",
ResDesc->u.Memory.Start.QuadPart, ResDesc->u.Memory.Start.QuadPart +
ResDesc->u.Memory.Length, ResDesc2->u.Memory.Start.QuadPart,
ResDesc2->u.Memory.Start.QuadPart + ResDesc2->u.Memory.Length);
rStart, rEnd, r2Start, r2End);
}
Result = TRUE;
@@ -609,20 +612,23 @@ IopCheckResourceDescriptor(
goto ByeBye;
}
break;
}
case CmResourceTypePort:
if (((ULONGLONG)ResDesc->u.Port.Start.QuadPart < (ULONGLONG)ResDesc2->u.Port.Start.QuadPart &&
(ULONGLONG)ResDesc->u.Port.Start.QuadPart + ResDesc->u.Port.Length >
(ULONGLONG)ResDesc2->u.Port.Start.QuadPart) || ((ULONGLONG)ResDesc2->u.Port.Start.QuadPart <
(ULONGLONG)ResDesc->u.Port.Start.QuadPart && (ULONGLONG)ResDesc2->u.Port.Start.QuadPart +
ResDesc2->u.Port.Length > (ULONGLONG)ResDesc->u.Port.Start.QuadPart))
{
/* NOTE: ranges are in a form [x1;x2) */
UINT64 rStart = (UINT64)ResDesc->u.Port.Start.QuadPart;
UINT64 rEnd = (UINT64)ResDesc->u.Port.Start.QuadPart
+ ResDesc->u.Port.Length;
UINT64 r2Start = (UINT64)ResDesc2->u.Port.Start.QuadPart;
UINT64 r2End = (UINT64)ResDesc2->u.Port.Start.QuadPart
+ ResDesc2->u.Port.Length;
if (rStart < r2End && r2Start < rEnd)
{
if (!Silent)
{
DPRINT1("Resource conflict: Port (0x%I64x to 0x%I64x vs. 0x%I64x to 0x%I64x)\n",
ResDesc->u.Port.Start.QuadPart, ResDesc->u.Port.Start.QuadPart +
ResDesc->u.Port.Length, ResDesc2->u.Port.Start.QuadPart,
ResDesc2->u.Port.Start.QuadPart + ResDesc2->u.Port.Length);
rStart, rEnd, r2Start, r2End);
}
Result = TRUE;
@@ -630,8 +636,9 @@ IopCheckResourceDescriptor(
goto ByeBye;
}
break;
}
case CmResourceTypeInterrupt:
{
if (ResDesc->u.Interrupt.Vector == ResDesc2->u.Interrupt.Vector)
{
if (!Silent)
@@ -646,20 +653,21 @@ IopCheckResourceDescriptor(
goto ByeBye;
}
break;
}
case CmResourceTypeBusNumber:
if ((ResDesc->u.BusNumber.Start < ResDesc2->u.BusNumber.Start &&
ResDesc->u.BusNumber.Start + ResDesc->u.BusNumber.Length >
ResDesc2->u.BusNumber.Start) || (ResDesc2->u.BusNumber.Start <
ResDesc->u.BusNumber.Start && ResDesc2->u.BusNumber.Start +
ResDesc2->u.BusNumber.Length > ResDesc->u.BusNumber.Start))
{
/* NOTE: ranges are in a form [x1;x2) */
UINT32 rStart = ResDesc->u.BusNumber.Start;
UINT32 rEnd = ResDesc->u.BusNumber.Start + ResDesc->u.BusNumber.Length;
UINT32 r2Start = ResDesc2->u.BusNumber.Start;
UINT32 r2End = ResDesc2->u.BusNumber.Start + ResDesc2->u.BusNumber.Length;
if (rStart < r2End && r2Start < rEnd)
{
if (!Silent)
{
DPRINT1("Resource conflict: Bus number (0x%x to 0x%x vs. 0x%x to 0x%x)\n",
ResDesc->u.BusNumber.Start, ResDesc->u.BusNumber.Start +
ResDesc->u.BusNumber.Length, ResDesc2->u.BusNumber.Start,
ResDesc2->u.BusNumber.Start + ResDesc2->u.BusNumber.Length);
rStart, rEnd, r2Start, r2End);
}
Result = TRUE;
@@ -667,8 +675,9 @@ IopCheckResourceDescriptor(
goto ByeBye;
}
break;
}
case CmResourceTypeDma:
{
if (ResDesc->u.Dma.Channel == ResDesc2->u.Dma.Channel)
{
if (!Silent)
@@ -683,6 +692,7 @@ IopCheckResourceDescriptor(
goto ByeBye;
}
break;
}
}
}
}